Straight Power BQT E5-500W,FSP Bluestorm II 500W (FSP500-60GLN),Seasonic S12-500 (SS-500HT),Tagan TG500-U25 (500W),Arena chieftec CFT-500A-12S (500W),Ultron UN-550PFC (550W),Enermax EG565AX-VE(G) FMA (535W),Sharkoon SilentStorm 120 500W (SHA500-12A),AcBel ATX-500CA-AB8FM (API4PC23-Y4DG),Amacrox AX500-60GLN (500W),Silverstone SST-ST50EF Plus (500W),Xilence XP480,Hiper HPU-4K530-MU V2,Levicom Polar Power 500W (SPS-LV500.W),Inter-Tech NitroX 500W (IT-7500SG)
Only the Silverstone 80+ certified ST50EF Plus was more efficient AND more silent than the Seasonic S12-500.
ATX cable length seems to be quite short at 30 cm compared to 53 cm at the Seasonic.
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noise at load level in sone:
20% 50% 100%
S12-500 0.1 0.1 0.6
ST50EF Plus 0.1 0.1 0.3
efficiency at load level:
20% 50% 100%
S12-500 78% 82% 80%
ST50EF Plus 83% 86% 82%